please help simplify the following and show work
[tex]3\sqrt{54} + 6\sqrt{288} - \sqrt{147}[/tex]
[tex](6\sqrt{3} + 5\sqrt{2} ) ( 2\sqrt{6} + 3\sqrt{8} )[/tex]
[tex]\frac{9-2\sqrt{3} }{\sqrt{3} + 6}[/tex]
[tex]\frac{x^{\frac{1}{4} } + 2 }{x^{\frac{1}{4} } -2}[/tex]